Projector



A. STUBER March 12, 1929.

PROJECTOR Filed Sept. 30, 1926 INVENTOR, gglph S ubez, BY

W/ ATTORNEYS.

Patente'cl Mar. l2, 1929.

UNITED STATES PATENT OFFICE.

ADOLPH STUBER, 0F ROCHESTER, NEW YORK, ASSIGNOR TO EASTMAN KODAK COM- PANY, OF ROCHESTER, NEW YORK, A CORPORATION 0F NEW YORK.

PROJECTOR.

Application filed September 30, 1926. Serial No. 138,647.

This invention relates to projectors particularly of the type in which images are thrown upon a screen from a transparency at an illuminated window.

Such projectors are frequently used by teachers and lecturers who both operate the projectors and discuss the projected pictures. It is frequently desirable to point out a particular part 'of the projected image and this is difiicult because the presence of the speaker is required at the projector.

An object of my invention is to provide a mechanism wheleby the operator can control a pointer without leaving the projector. This object is obtained by positioning, sufiiciently near the exposure window to be projected in reasonably sharp focus, a pointer which can be moved at will across the light beam so that its image will be projected with the picture and can be used to indicate any selected part.

Other objects and advantages will appear' in the following description, reference being made to the accompanying drawing, wherein the same characters denote the same parts throughout and in which Fig, 1 is a side elevation of a projector embodylng my invention7 various concealed elements being shown in broken lines.

Fig. 2 is a section on the line 2-2 ot' Fig. 1, showing the pointer mechanism, but omitting the film chambers.

Fig. 3 shows a typical image as projected on a screen.

Fig. 4 is a framentary view showing a modified form of control mechanism.

The projector with which I have chosen to illustrate my invention comprises a lamp house 1, with a Ventilating opening 2, and containing a lamp 3, carried on a suitable base 4. A catch 5 is shown by which the lamp house can be secured to a suitable supporting base, not shown. In the front wall 6 of the lamp house is supported a condenser 7. The casing 8 extends forwardly from the lamp house and comprises two side walls 9 and 10. lVall 9 extends up to form a wall 11 of film chamber 12 and down to form a side wall 13 of chamber 14. Between walls 9 and 10 is a wall plate 15 having a curved front ortion 16 and a flat bottom portion 17. upported on the front wall 16 is a second curved sheet 18, the ends of which are curved to form the cylindrical walls 19 and 20 of the tlm chambers 12 and 14.

livoted on pin 21 on wall 9, forwardly of the parts 16 and 18, is a member 22 bowed to fit wall 18 and resiliently pressed against it by spring 23 coiled around pin 21 and with its ends 24 and 25 contacting the cylindrical wall 20 and member 22 respectively.

Registering apertures are formed in members 1G, 18 and 22, which constitute a gate, to form a window 2G in alignment with condenser 7. A sprocket 2T having teeth 28 is supported between walls 9 and 10 and may be turned by the knurled finger pieces 29 on shaft 30 extending through the walls. The sprocket is used to advance the film 50, the teeth extending through slots 31 in members 16 and 18.

On the front wall (i of the lamp house 1 is a pin 32 carrying a mechanical syst-ein, here shown as a pantograph lever system 33 comprising two long arms 34 and 35, one of which, 34 is pivoted on pin 32 and two short arms 36 and 37 pivoted to the ends of the long arms, the arm 3G having a bent portion 38 carrying a pointer 39 within the casing and the arm 3T carrying a manipulating handle 40 outside the casing. Parts of this system extend out of the casing, the top heilig open between the Walls 9 and 10, and the wall 9 of which has an opening 41.

A washer 42 spaces the lever system from the wall 6.

\Vall 9 is continued forwardly and is bent at (32 to embrace an objective mount 43, the objective being in alignment with the window 2G, condenser 7 and the lamp fila ment, situated at 44. 'lhe wall 9 has a strengthening boss 45 and the lamp house has bosses 46.

The apparatus shown is used principally for the projection of still picture from a piece of film 5t), a loose coil of which is placed in the upper chamber 12, over pin 47. The film is threaded between presser 22 and the fixed wall 18 and as the film is advanced itl will coil itself loosely about pin 48 in chamber 14. It is to be understood that the film chambers and gate are open toward the rear in Fig. 1.

The described details of the projector as a whole are not a part of my invention and are included merely to illustrate an apparatus in which my invention is embodied.

'ill

Certain features of this projector are more tally shown in an application of H. C. Wellman Serial No. 138,648, tiled Sep. 3G, 1926.

lt is obvious that as the end of thehau ille moved from e position shown in dotted lines to the fini line position {Fig if; the end of the pointer Will be moved in a reve se direction that these may be consideren as conjugate points of the mechm anisin, the direction of their movements ing always opposite the extent of movem ment being dependent on the proportions of the lever arms. sl own the movement of the handle will oe greater than that of the pointer. The paris may be loosely pivoted so that the weight ot' the handle will nori'naily cause it to 'li-.ill to the dotted line position, raising the pointer out of alignment with the window, but there may be suiiiciei'it friction to hold them in adjusted position.

The operator, when he desires to point to a particular part of "r'if' that being prolmove the hand from its position of in an upward direction, thereby mov ing the -pointer across the projection beam in a reverse downward direction. Since he projected image is inverted, the image ot the pointer will move across the screen in an upward "on The operator, therefore, merely moves the handle l0 in the direction in which he Wishes the pointer to appear to move. In Fig. 3 the image of the pointer is shown at 49 as it would appear upon a projected image l.

lt to be understood that other mechanical systems, such as are Well known, having two conjugate parts interconnected for rev` movement, are to be considered the eqi.. aient of the pantograph s stem shown.

A typical alternative form is own in Fie. 4, in Which the mechanical system alone is shown. On the pin 32 is pivoted a casing comprising two plates 52, one of which is not shown, connected by pins 53 on which are rollers 54 hearing against the backs of rash bars 55 and 5G, the teeth of which intermesh with opposite sides of pinion 5i', also pivoted on pin 32 between the plates. @ne racl 55 is extended to form a handle 58 and other to form a pointer 59. The use and position of this system is the same as of that previously described.

it is obvious that numerous other embodiments of my invention are possible. l consider as within my .invention all such modib ti and equivalents as fall within 'the n the appended claims. i Having thus described my invention, what 'im as new and desire to secure hy liet v frame. a su 'are leld an mogen ber at said field, .an optical system carried by the frame for projecting images said field, a pointer morably supporte on the frame for free movement in ,f fd tion across said field, and member connected to tl 2. A projector compr port on the frame 'with having means for supporting an i j ing' eiement at said field, an optical w carried by the frame for proj, ctii ia" from said field, a pointer znovubly supL by the frame for free movement in una, 1lirection over the entire member and a lever s said member and pointer.

ln a projeter, a frame, :in expe, gate. an optical system c able et' pred an inverted image of an 1 i t said a mechanical system carried lib and having conjugate parts intereontoeil for simultaneous movement in reverso flirections, a pointer connected to one said parts for tree motion in any direction across the gate, and a handle connected other 'it' said paris, whereby a more f. the handle. .in oney direc @on will produ.; reversed :movement of the pointer across the gate and the inverted image of the pointer will more in the same direction as *'he handle.

4. ln a projector, a trame, a source of light, an exposure gate and a projection ebjective supported in alignment by said frame, whereby a beam of light from s d source is projected through the gate and objective, a mechanical system pivotally mounted on the frame near the gate and having conjugate parts interconnected for lsimultaneous movement in reverse directions7 a pointer carried by one of said parts and capable of .tree movement in an direction across the beam, and a handle carried by the other of said parts whereby a movement of the handle in one direction will produce a reversed movement of the pointer across the gate and a movement of the image of the pointer in the same direction as the handle. 5. ln a projector, a frame including a cas ing, an exposure gate having a window in said casing, an optical'system carried by said frame and capable of projecting a beam of light through said Window, a mechanical system mounted on the casing near the Window and having conjugate parts intereonl2* nected for simultaneous movement in re verse directions, a pointer carried by one of said parts within. the casing and capable of free movement in any direction across the beam near the Window, and a handle car- 'f ried by the other of said parts outside the easing whereby movement o the handle in one'diicction ill canse a movement or rhe imaffe in the same direction. .in lirogectz frame, an espiar gate, an optical system capable of projecting an image of an object at said gate, a pantograph lever system pivotally mounted at a point on said frame near the gate and including two elements having movements in opposite directions with respect to said pivotal point, a pointer carried by one of said elements and capable of free movement in any direction over the entire gate, and a manipulating handle carried by the other element whereby movement of the handle in one direction will cause movement of the projected image of the pointer in the same direction.

7. In a projector, a frame including a casing, a source of llght within said casing,

an optical system carried b the frame, for projecting a beam of light rom said source, a support for holding an image bearing transparency in said beam, a pointer within said casing near said support, a manipulating handle outside said casing, a pantograph lever system pivotally mounted on said casing near the support and carrying the pointer and handle on opposite sides of the pivot point, whereby a movement of the handle will cause a, reversel directed movement of the pointer across t e beam.

Signed at Rochester, New York, this 25 day of September, 1926.

ADOLPH STUBER. 

